Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income Attributable to Graphic Packaging Holding Company	$ 107	$ 54
Weighted Average Shares:
Basic (shares)	308.8	275.8
Dilutive effect of RSUs (shares)	0.9	1.4
Diluted (shares)	309.7	277.2
Earnings Per Share — Basic (in dollars per share)	$ 0.35	$ 0.20
Earnings Per Share — Diluted (in dollars per share)	$ 0.35	$ 0.19